Experimental study of the rolled metal straightening on multi-roll leveler
DOI:
https://doi.org/10.37142/2076-2151/2023-1(52)138Keywords:
plate, straightening, leveling machine, mathematical model, finite element model, experimental studies, force measurement.Abstract
Gribkov E., Dobronosov Yu., Kovalenko A. Experimental study of the rolled metal straightening on multi-roll leveler
Straightening of rolled sheets plays an important role in shaping the quality characteristics of the finished product. Modern metallurgical plants use multi-roller sheet straightening machines with individual roller settings. These machines have a flexible system of technological settings, which requires a mathematical model of the plate levelling to solve computer-aided design problems. Moreover, if for steels for general engineering purposes the rational value of the position of the rollers is in a wide range, then for high-strength steels this is a very narrow field, requiring a very accurate result from the mathematical model. The most accurate models are those based on the finite element method. In this work, a finite element model of the plate straightening process in a multi-roller machine was developed. To verify the adequacy of the developed model, experimental studies were carried out in laboratory conditions. The laboratory setup was a 9-roller sheet straightening machine with a roller diameter of 100 mm, located at 105 mm pitches. The rollers were adjusted using a screw mechanism. The study was carried out for a 5-roller version of the machine. All rollers were driven. Experiments were carried out for sheets of three thicknesses: 2.5, 3.5 and 9.0 mm. The width of the sheet for a thickness of 2.5 mm was about 150 mm, for the rest - 100 mm. 4 sheets of each thickness were used. The straightening force was measured using ring gauges installed between the pressure screw and the roller pad. An ADC was used to process the signal. Comparison of experimental data on plate straightening processes with calculation results indicates their qualitative and quantitative agreement. At the same time, the error in calculating the straightening force on the third roller did not exceed 16.5 %. The comparison shows a sufficient degree of reliability of the developed mathematical models and the possibility of their application on existing industrial equipment.
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